Rim-removing tool for pneumatic tires



Nov. 22, 1949 R. o. HOLBROOK y 2,488,539

RIM-REMOVING TOOL FOR PNEUMATIC TIRES Filed Nov. 26, 1945 ROBERT O'.l/oLB/aooK. BY Ww HTTOENE Y Patented Nov. 22,71949 RIM-REMOVING TL FORPN EUMATIC TIRES Robert 0. Holbrook, United States Navy v ApplicationNovember 26, 1945, Serial No. 630,956 1 Claim. (l. 1517-12) v (Granted`vunder the act of' March s, 1883, as

This invention relates in general to a tire casi ing removing device orpress, and in particular to a device in which rimand tire-engagingmembers are applied and forced in opposite directions to separate therim and tire.

After a tire has been on a rim vfor a periodof a month or longer, it isnot unusual for a bond to form between the tire and the rim preventingeasy separation of the two. Many methods employed in attempting toremove the tire from the rim usually result in vconsiderable damage tothe tire and entail a great deal of time and effort.v

This invention is primarily designed for use on truck tires and rimsthat-employ a removable lock ring, but Vmay be adapted for use with anytype rim for breaking loose the tire from the rim.

An object of this invention is to provide a tire and rim separatingdevice. n f Another object is,A to` provide a tire casing removingdevice in which rim-engaging means and tire-engaging means are employedand in which further mean-s are provided to move one or bothaforementioned means in linear opposing directions to force the tirefree from the rim.

Another object is to provide a tire-engaging means that can be urgedinwardly between the ange of the rim and the tire.

Another object is to provide a rim-engaging means moveable inwardlytoward and outwardly from a central axis to engage and disengage a tirerim.

. amended Avlrilr30, 1928; 370 0. G. 757

" Threaded hub 2I and 2 sliding sleeve 22 are connected together byretainer 23 which enables the hub 2| to traverse sleeve 22longitudinally of sleeve 2.

A plurality of links 25 are pivotably secured to but removable from ring2B, carried by sleeve 22,

Further objects and advantages of this inven- 8 tion, as well as itsconstruction, arrangement and operation, will be apparent from thefollowing description and claim in connection with the accompanyingdrawing, in which Figure l is an elevation, half in cross-section,illustrating an embodiment of the invention, and

Figure 2 shows a portion of a tire-engaging arm embodied in theinvention.

The drawing shows a tire assembly comprising a tire casing Il), mountedon rim II, the rim having a ilange I2. The edge I3 of the rim normallycarries a removable lock ring, not shown as it is removed before thetire is dismounted.

A central threaded standard or screw I4 carries the rim-engaging meanswhich comprises a plurality of removable fingers I5, each having a lipI6 adapted to engage edge I3 of rim II. The fingers I5 are pivotallycarried by ring I'I which, by means of the carriage comprising theradial arms I8 and hub I9, is threaded to the screw I4.

Secured to hub I9 is a hollow externally threaded sleeve member 20.Threaded to member 20 is the hub 2| of the hand wheel 24.

and to lugs 2l on each of the fingers I5.

The tire-engaging member is also carried by the screw I4, and itcomprises a carriage having a hub 28 and radial spokes 29 from which thearms 30 are pivotally suspended. Hub 28 is supported by an externallythreaded sleeve Si which, with the carriage of arms 30, is adapted toslide longitudinally of screw I4. A collar 32 is secured to screw I4 ata predetermined position and supports or retains the tireeng'agingmember in iixed position longitudinally of screw I4. The hub 28 of thecarriage of the tire-engaging member is mounted rotatably on the shaftof screw I4, and the sleeve 3| provides a thrust bearing which locatesthe hub 28 length- Wise of screw I4.

A collar or hub 33 is mounted to slide along sleeve 3l and carries aplurality of links 34 pivotably attached thereto. Each of said links 34is also pivotably connected at the other end, to one of the arms 30. Hub35 of the tire-engaging member hand wheel 36 is threaded to the sleeve3| and is rotatably connected to hub 33 by retainer 31.

Attached to the end of each arm 30 is an inwardly curved enlargedportion or member 38 which is adapted to contact the tire I0. A hammerblock 39 is positioned behind and slightly above each curved member 38.The upper end of each arm 30 is provided with an elongated opening 40(Figure 2) at the position said arms 30 depend from spokes 29.

Rotation of the central screw I4 is accomplished by means of the handwheel 4I which is suitably secured thereto by means of key 42 and locknut 43.

An eye 44 may be provided for lifting and supporting the entireassembly.

In operation, the lock ring, not shown, is rst removed from the rim II,and the tire l0 and rim II placed flat with the flange I2 in upposition. The tire press is then positioned, by means of ring 44,concentrically within the rim II, and the fingers I5 are manipulated byactuation of handwheel 24 to place the edge of the rim I3 on the lips I6of fingers I5, lingers I5 being forced outwardly to form engagement withrim II.

Handwheel 4I is then rotated to raise the carriage I8, I9 on the screwI4, and thereby to raise the tire assembly into engagement of casing Iwith the curved members 38 cf arms 30. Handwheel 36 is also rotated toposition the curved member 38 between the casing I0 and flange I2 of rimII. If necessary a hammer is used on hammerblocks 39.

When the curved members 38 have been rmly placed between the tire I0 andflange l2, handwheel 4I is again rotated to traverse the carriages I8,i9 and 28, 29 towards eachother. rIheV tire engaging members 38 and lipsI6v move opposed'v to each other to actuate the casing IU off of the rimII.

The fingers I and arm ilareremovablev from. the carriage I8, I9, asshown, to allow the apparatus to be used with some special type rimswhich the press would not otherwise normally t.

The hand-operated screw presses now in operation exert up to ve tonspressure which is normallysuiflcient. In certain extreme cases howevergreater pressure has been required and has been obtained by replacingthe wheel and screw with hydraulic mechanism. Other substitutions couldobviously be made.

It is to be understood that various modifications and changes maybe madein this invention without departing from the spirit and scope thereof asset forth in the appended claim.

The invention describedA herein may be manufactured and usedv by or forthe Government of the United States* off America for governmentalpurposes without the payment of any royalties thereon or therefor.

Whatis claimed is:

In apparatusA for disassembling the assembly oi a tire anda rim, a screwcomprising an attachment at one end thereof to suspend it from anoverhead' support, a rim engaging component comprising a carriagethreaded to the screw at the lower end thereof, a plurality of rimengaging arms suspended from the carriage of the rim engaging componentin a circle coaxial with the screw, mechanism between the rim engagingarmsn and, their marriage#y operable alternatively to spread or. retractthe several arms in unison, a tire engaging component comprising acarriage mounted rotatably on the screw, a thrust bearing holding, the,carriage of the tire-engaging component' at' aV predetermined positionlength- Wise of the screw, a plurality of tire engaging arms mountedonthe carriage of the tire engaging` component in a c ircle coaxial withthe screw, mechanism between the tire engaging arms and their carriageoperable alternatively to spread or retract the several arms in unison,a device to rotate the4 screwl to traverse the carriage of the rimengagingcomponent relative to the tire engaging component.

ROBERT O. HOLBROOK.

REFERIENGES CITED The following references are of record in the le ofthis patent-z UNITED STATES PATENTS` Number Name Date 1,552,928:I-Ilershon- Sept. 8, 1925 1,564,092 Miller Dec. 1, 1925 1,564,496Staugaard Dec. 8, 1925 1,729,861 Anderson Oct. 1, 1929 2,373,975 Plumeauet al. Apr. 17, 1945 2,446,963 Stolz Aug. 10, 1948 FOREIGN PATENTSNumber Country- Date 659,107' Germany Apr. 25, 1938

